Car batteries, in general, typically vary in price from $45 to $250, depending on the power, size, and quality you choose. A Mazda 3 car battery will likely cost around $240.
You’ll need to talk to a local dealership, auto parts store, or mechanic to learn the exact price of replacing your battery. Keep in mind that you’ll need to pay for labor if someone else installs the battery for you, which could cost an additional $25 to $50. However, some shops do free installation, so it never hurts to shop around.